The Implosion of a Sphere of Trapped Photons and the Collapse of a Wolf-Rayet Star
A simple model of an imploding sphere of trapped photons is presented. The collapse of a massive Wolf-Rayet star is an example of an imploding sphere of photons.
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In a simple model of an imploding sphere of trapped photons, such as the implosion of the opaque shell of a Wolf-Rayet star, gravitational collapse drives the heating of the photon gas.
A sudden loss of opacity in the surrounding shell of material will make the Wolf-Rayet collapse process appear like some gigantic flash bulb, which would release a considerable amount of energy and may be the source of high energy Gamma Ray Bursts.
(see also "Are Wolf-Rayet Stars the Progenitors of Long-Duration Gamma Ray Bursts" also by the author and posted at archive.org).